10k kills in multiplayer matches only aint gonna happen now unless you put serious time into it

The only players you will find on Gears 1 multiplayer (and there aint no bots) are either experts or glitchers!

But yea Gears 2 kills count across all modes getting 100k isn't that hard but there are also ways to grind it in certain chapters of the campaign. I can't remember the level or chapter but it's when you are using the Brumak.

Find yourself on the leaderboards then view stats. But the figure will be wrong. I know many people who unlocked it at about 11-13k kills due to disconnects and matches not registering even though the kills did.